The most common and most likely answer to this crossword clue is the 9 letter word TRILLIONS
I've seen this crossword clue in The Daily Telegraph
T
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I
L
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More clues leading to the result TRILLIONS
Buddy explains!
The straight part
We know that "19 of 19 of 19 of 19" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case 19 of 19 of 19 of 19 = trillions.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does TRILLIONS mean?
TRILLIONS noun- A statistic formed by a player playing some number of minutes, but recording no stats.